[Greylist-users] Postfix?

[Franck Arnaud]

Valor Rom=E1:

> What do you mean exactly by TXT hijacking?

Sorry for the confusion: it's not a security issue,=20
just an inelegant way to extend the DNS standard:

TXT is supposed to be for comments. Putting something=20
meaningful into a the DNS TXT field, is not the way it=20
is designed to be extended. It is subject to confusion=20
if say someone puts a comment that happens to look like=20
one of the proposed standards but is really a comment
(arguably, it's a bit unlikely).

The proper way to extend the DNS is to add a new=20
record type. This for some DNS clients or servers=20
may require recompilation (to use the new field --=20
old clients that are not recompiled will ignore=20
the new field and will not have problems) and that's=20
what they want to avoid by reusing TXT for another=20
purpose.